ILLINOIS · STATEWIDE · FCC DATA

Best cell phone coverage in Illinois Illinois, statewide · AT&T · T-Mobile · Verizon

Verizon reports the widest coverage in Illinois: 96% of the area outdoors, 12.4 points ahead of T-Mobile. AT&T is close enough behind that the top two are effectively level.

Figures are the share of Illinois's area where each carrier reports 4G LTE or 5G service to the FCC, as of December 31, 2025. A state or city figure can hide dead spots, so check your own ZIP code below.

RESULT · ILLINOIS

Coverage in Illinois

FCC filings as of December 31, 2025

★ WIDEST REPORTED COVERAGE
Verizon
96%

Verizon reports 4G LTE or 5G across 96% of Illinois outdoors and 58.8% in a moving car. AT&T is close enough behind that the top two are effectively level.

Outdoor
96%
In car
58.8%

AT&T vs T-Mobile vs Verizon in Illinois

#1
Verizon
Reported coverage, % of area
Outdoor
96%
In car
58.8%
#2
AT&T
Reported coverage, % of area
Outdoor
93%
In car
72.1%
#3
T-Mobile
Reported coverage, % of area
Outdoor
83.6%
In car
44.9%

Outdoor is the share of the area where the carrier reports 4G LTE or 5G to a phone standing still outdoors; in car is the share it reports to a phone in a moving vehicle, which is always lower. Indoor signal is not part of the FCC filing and can be weaker than either.

4G and 5G across all carriers in Illinois

4G LTE
97.4%
5G 7/1
87%
5G 35/3
76.1%

Share of Illinois's area where at least one carrier reports each technology outdoors. "5G 7/1" means 5G of at least 7 Mbps down and 1 Mbps up, "5G 35/3" at least 35/3 Mbps, the two speed tiers the FCC publishes. The FCC summary does not split 5G by carrier.

Checking Verizon for your address

Verizon's filing covers the most of Illinois. A cheaper plan on a carrier that doesn't reach your street costs more than it saves, so start from coverage and pick the plan second. Every carrier's own map lets you check a street address.

Verizon coverage map → AT&T coverage map → T-Mobile coverage map →

Coverage in Illinois's largest cities

Other states